Linked Questions

16
votes
2answers
1k views

Why do we have more male infants born?

For every 104 male babies, we have 100 female babies and there are statistics which are more reliable. (Those tell us that we have 997 female infants born per 1000 male infants born.) What is the ...
4
votes
4answers
728 views

Gametes of two different species

I always wondered why gametes from two different species dont fuse together to form an offspring. eg a donkey (sperm) and a female dog (egg) I know this is not possible but I'm just curious.
5
votes
2answers
14k views

Why are the sex chromosomes called X and Y?

Is there a specific reason that the letter Y is used as the symbol for the male chromosome and X is used for the female chromosome?
5
votes
1answer
2k views

How genetically similar are worker ants from the same colony?

I've been reading https://en.wikipedia.org/wiki/Ant and it says If the egg is fertilised, the progeny will be female diploid; if not, it will be male haploid. Since the males have only one set of ...
6
votes
1answer
409 views

Why are mice with a single X chromosome and no Y chromosome males?

I was searching online and I read this article Mice can be male without Y chromosome and this is a part of it: The experiments demonstrate that there are multiple ways to make males, says Richard ...
0
votes
2answers
1k views

Why boys who inherit more genes of their mother are not born as girls and girls who inherit more genes of their father not born as boys?

If boys as well as girls inherit the genes of the father as well as mother, does it imply that boys inherit more genes from the father to be boys and the girls inherit more genes from the mother to be ...
0
votes
2answers
796 views

Does chromosome cross occur over male and female or vice versa? [closed]

My understanding is homologous chromosome pair, which means male and female chromosome inside the DNA. So if that's homologous how does male do with female? Does it flip over and change direction, ...
4
votes
1answer
221 views

What's the determinant of the male-biased birth sex ratio in humans? [duplicate]

Will the baby be male or female? If it was a random biological switch then, with a huge sample number, the sex ratio at birth would be exactly 50-50. But it isn't; the ratio is about 51-49 in favour ...
6
votes
2answers
490 views

What is the right definition of 'Sex Linkage'?

I am confused about definition of "sex linkage". I have found different definitions but they do no match. From P.S Verma, V.K Agarwal cell biology, genetics, molecular biology, evolution and ecology: ...
3
votes
1answer
238 views

Sex determination in cephalopod?

I see some source say octopus do not have sex chromosome. So what's the sex determination mechanism for cephalopods?
0
votes
2answers
133 views

What is the X-chromosome responsible for? [closed]

I understand that the X-chromosome is responsible for certain disorders, like red-green colorblindness; but besides disorders, what do the genes on the X-chromosome determine?
2
votes
1answer
99 views

What determines sex in birds?

Is there production of TDF in birds? If so which gene produces it?
3
votes
1answer
139 views

Can sexual selection operate in temperature dependent sex determining organisms?

Or more broadly, are distinct forms of genetic inheritance (ie. sex chromosomes) needed for sexual selection? My thinking was that since there are no sex determining loci, there could not be linkage ...
0
votes
2answers
58 views

In animals, birds, reptiles and fish, is a male sometimes unnecessary for a female to have/extend a male

Apparently in the human (animal realm) there are females that are female in body but their DNA is (XY) male, apparently 7500 in U.S., but apparently not able to have children ( http://abcnews.go.com/...
2
votes
2answers
90 views

Is there any system how genes are spread across chromosomes?

Every chromosome being a wrapped DNA molecule contains thousands or more genes. Now, is there any system why a gene A goes to a chromosome K and gene B to chromosome J?

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